https://atmos.meteo.uni-koeln.de/ag_crewell/ 2026-04-14T09:27:38+00:00 https://atmos.meteo.uni-koeln.de/ag_crewell/ https://atmos.meteo.uni-koeln.de/ag_crewell/lib/exe/fetch.php?media=wiki:logo.png text/html 2026-02-06T16:54:09+00:00 Anonymous (anonymous@undisclosed.example.com) https://atmos.meteo.uni-koeln.de/ag_crewell/doku.php?id=instruments:grawac:grawac&rev=1770396849&do=diff G-band Radar for Water vapor profiling and Arctic Clouds GRaWAC Principle GRaWAC is an active Frequency Modulated Continuous Wave (FMCW) cloud radar with dual frequencies at 167.3 and 174.7 GHz with Doppler capabilities. GRaWAC can be operated on an aircraft (nadir looking) or from the ground (zenith observations).